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July 29, 2015

Homework Help: chemistry - exam practice help!!

Posted by Anya on Thursday, December 13, 2012 at 10:44am.

Given the table below predict the numerical value of the standard cell potential for the reaction:
2 Cr(s) + 3 Cu2+(aq) 2 Cr3+(aq) + 3 Cu(s)

Half Reaction E (volts)
(1) Cr3+ + 3 e- Cr E= -0.74
(2) Cr3+ + e- Cr2+ E=-0.41
(3) Cr2O72- + 14 H+ + 6 e- 2 Cr3+ + 7 H2O
E= 1.33
(4) Cu+ + e- Cu E= 0.52
(5) Cu2+ + 2 e- Cu E= 0.34
(6) Cu2+ + e- Cu+ E= 0.16

how do i do this?

options:

a ) -0.4
b) 2.5
c) 1.08
d) 0.417
e) -1.08

(all units are volts)


i tried

E(products) - E(reactants) but it didnt work, i didnt get any of the options. :S

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